Question

Please solve this question.
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Answer 1

Answer:

sorry I didn't know that

Answer 2

Answer:

(377+168√5)/(14+6√5)

Step-by-step explanation:

a² = (3+√5)² = 9+5+6√5 = 14+6√5

So, a² + 1/a² = (14+6√5) + 1/(14+6√5)

= ((14+6√5)²+1)/(14+6√5)

= (196+180+168√5+1)/(14+6√5)

= (377+168√5)/(14+6√5)

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